IXL - Add and subtract numbers written in scientific notation (Algebra 1 practice)

Add. Write your answer in scientific notation.

(

3.99

)

(

2.27

)

9.06

6.26

9.06

6.26

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question

Subtract. Write your answer in scientific notation.

(

)

–

(

3.8

)

2.66

3.2

2.66

key idea

A number written in scientific notation has two factors multiplied together. The first factor must be 1 or more, and it must be less than 10. The second factor must be a power of 10.

solution

Look at the powers of 10 in each number.

(

)

–

(

3.8

)

Both numbers have the same power of 10, so you can subtract them using the distributive property.

(

)

–

(

3.8

)

(

–

3.8

)

3.2

Looking for more? Try these:

Lesson: Adding and subtracting numbers in scientific notation

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Teacher tools

Work it out

Not feeling ready yet? These can help:

T.1Convert between standard and scientific notation

C.9Multiply powers: integer bases

D.1Add and subtract decimals

Lesson: Adding and subtracting numbers in scientific notation

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